[ARM64] removed unused variable.

src/arm64/full-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 3886 matching lines @@
 void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   Variable* new_target_var = scope()->DeclarationScope()->new_target_var();
   GetVar(result_register(), new_target_var);
   __ Push(result_register());
 
   EmitLoadSuperConstructor();
   __ Push(result_register());
 
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, args_set_up, runtime;
-  Register caller_fp = x11;
   __ Ldr(x11, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ Ldr(x12, MemOperand(x11, StandardFrameConstants::kContextOffset));
   __ Cmp(x12, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
   __ B(eq, &adaptor_frame);
   // default constructor has no arguments, so no adaptor frame means no args.
   __ Mov(x0, Operand(0));
   __ B(&args_set_up);
 
   // Copy arguments from adaptor frame.
   {
@@ skipping 1563 matching lines @@
   return previous_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64